/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/MeshNormals.h
Compute overlay normals for the given mesh, for the given set of element IDs
static bool RecomputeOverlayElementNormals ( [FDynamicMesh3](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3) & Mesh, const [TArray](API\Runtime\Core\Containers\TArray)< int32 > & ElementIDs, bool bWeightByArea, bool bWeightByAngle )